This handy LED bulb casts a bright, pleasing and consistent light. Although classified as "cool white," it seems to render colors fairly naturally, and does not cast a chalky or antiseptic glow as do old fluorescent bulbs. I agree with the skepticism of other reviewers over the manufacturer's claim to brightness equivalent to a 100-watt incandescent. While I haven't seen any scientific testing of that claim, I would estimate the brightness as closer to a 75-watt incandescent.
The plastic sleeve covering this bulb reads: "Not for use with dimmers" and "Not for use in totally enclosed recessed fixtures." This "long" version measures 5.5 inches long, from end to end. You should carefully measure the length (depth) of your light fixture, to make sure this long bulb will not protrude well beyond the end of your fixture. If your fixture measures well under 5.5 inches deep, you should consider the short version of this bulb -- EvoLux Sh 13 Watt LED Medium Base Short Light Bulb, Cool White -- which measures 4.5 inches from end to end.